Earth's Structure and Composition

The video explains the compositional layers of the Earth, including the crust, mantle, outer core, and inner core. It discusses how scientists have used seismographs to understand these layers over the past century. The crust is the thinnest layer, made of tectonic plates that float on the mantle. The mantle, the thickest layer, is solid but flows slowly, driving plate tectonics. The outer core is liquid iron and nickel, while the inner core is solid due to immense pressure. The video highlights the ongoing scientific study of Earth's layers.

What is the outermost layer of the Earth called?

• Crust

• Core

• Mantle

• Lithosphere

Which type of rock primarily makes up the Earth's crust?

• Limestone

• Metamorphic

• Igneous

• Sedimentary

What is the name of the supercontinent that existed millions of years ago?

• Gondwana

• Atlantis

• Laurasia

• Pangaea

What is the primary composition of the Earth's mantle?

• Liquid iron

• Solid silicate rocks

• Molten nickel

• Gaseous hydrogen

How does the mantle contribute to volcanic activity?

• By cooling the crust

• By solidifying tectonic plates

• By providing liquid water

• By melting rocks to form magma

What is unique about the Earth's outer core?

• It is the hottest layer

• It contains solid iron

• It is made of silicate rocks

• It is the only liquid layer

Who discovered the Earth's outer core?

• Albert Einstein

• Isaac Newton

• Marie Curie

• Inge Lehmann

Why is the inner core solid despite its high temperature?

• Because of its composition

• Because it is cooler than the outer core

• Due to low pressure

• Due to high pressure

What is the approximate temperature of the Earth's inner core?

• 7,000 degrees Celsius

• 5,000 degrees Celsius

• 10,000 degrees Celsius

• 3,000 degrees Celsius

How do scientists study the Earth's layers today?

• By analyzing surface rocks

• By drilling to the core

• Through direct observation

• Using advanced technology